Why do we hear the sound of sea waves a conch shell?

Sound that is caught in the ear is certainly not that of sea waves. It is the sound of blood circulating in the ear. A conch shell pressed on the ear increases the volume of sound besides producing echo of the pulsating vein in the ear so that echoes of the pulse are heard clearly. Not only conch shell but even a metallic drinking glass when held near the ear does not fail to give experience of musical rhythm of sea waves. More puzzling is the case of pyramid rather than that of the glass. In an ancient room known as the king’s chamber inside the pyramid of Giza if one remains standstill alone for about fifteen minutes, he can hear the sound of his own blood circulation as muted echo!

Additional reading:
Conch (Wikipedia)

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